Bornite-after-Covellite with Digenite, Pyrite, Arsenopyrite

specimen number:
3671130

location:
East Colusa mine, Butte, Silver Bow Co., Montana, USA

description:
Excellent old-time piece from Butte with large thick platy crystals of what were once covellite to almost 2.0 cm in size now replaced by bornite and set on matrix with minor digenite, pyrite, and arsenopyrite. This is in very good condition. At first a few of the crystals appear as if they were broken, these are completely natural and completely replaced by the bornite.

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